Heat regulator



Feb. 25, 1930.

'M. O. SNEDIKER HEAT REGULATOR Filed Oct. 5. 1923 In the drawings,

Patented Feb. 25, 1930 UNITED STATES PATENT OFFICE HORTON O. SNEDIIIB, OF CHICAGO, ILLINOIS, ASSIGNOB TO .I POWEBB REGULATOR CODA, OF OHIOA ILLINOIS, A CORPORATION OF ILLINOIS mwr uncommon 1 Application filed October a, 1928. Serial No. 810,102.

My inevntion relates to heat controlling devices and particularly to an improvement on the controlling mechanism for so-called heat units, in which a heat exchange device, such as a radiator, is used in association with a. fan or blower for directing air over said radiator.

While devices of this general character are in common use, an objection thereto is that the fan or air circulating deviceis constant-- ly operating unless manually turned on and shut oflz'. Thisinvolves a waste of power as there is no occasion for circulation of air when heat is shut ofl' from the radiator.

; However, any fan-controlled device operating in unison with the shut-off valve for the heat is inadequate and unsatisfactory for the reason that the fan should run for an appreciableperiod following the shut ofi of the 1 heat to the radiator in order to dissipate the heat already supplied to the radiator. This result is accomplished in the mechanism herein described.

The invention will be more readily under- 5 stood by reference to the accompanying drawings, in which Fig. 1 1s a new somewhat dlagrammatlc in form, showing a device constructed in accordance with "my invention;

0 Fig.2 is an enlarged elevation partly in section showing the means for controlling the1 heat supply valve and the motor switch, an

Fig. 3 is a front elevation of the switch.

I have illustrateda heat cabinet. 10, having a radiator 11 therein, to which steam is supplied through the pipe 12. A fan is indicated at 13, a motor at 14, wires at 15 from the motor to a switch box 16,

.0 the details of which will be later described.

A thermostat'is shown comprising a bellows 17 which'serves to actuate a stem 18. A balanced-shut-ofivalve is shown at 19 and a valve stem 20 projects through a bonnet 21 acting as an extension of .the thermostat stem 18. A socket 22 is provided on the lower end of the valve 19 and a head 23 on the stem 20 enters the socket with capacity for lost motion to the extent of the s ace 24.

50 A coil spring 25 extends between t e valve socket and an annular collar 26 on the stem 20, and holds the. valve in the seated position rounded head 28 of a bolt that is fixed'in an oscillatin arm 29. The free end of the arm 29 overlies the head of a bolt 30 that extends through a second arm 31 and is held in operating position by means of the coil spring 32. The arm 31 is limited in its oscillation by the pins 33-34.

A link 35 connects the free end of the arm 31 to a mercury switch bulb 36 which is pivoted at 37.

With the parts in position shown in the drawings, the steam is shut ofi by the valve that the temperature of the space containing the thermostat has lowered and the thermostat stem has begun a downward movement, continued downward movement will cause corresponding movement of the arms 27, 29 and 31 and the rockin of the mercury switch 36, sutlicient to mike contact and start the motor fan. Further movement of the thermostat will cause downward movement of the valve 19 and permit the entrance of the steam to the radiator.

When the temperature of the space has reached a predetermined point, the thermostat will move the stem upwardly and close the valve 19 but the motor fan will not be shut off until the stem has moved upwardly to the extent of the lost motion 24 in the socket. Thus the fan will continue to operate for an appreciable period after the supply of steam has been interrupted. After the arm has moved to the position of Fig. 2, the weight of mercury in the bulb will cause the bulb to rock into the position shown, and

19 and the fan is idle. However, assuming the contact broken. Thus the operation is I the temperature of the incomin air. In other cases, the thermostat may e located at a more. distant point, the control of the valve and motor switch being through the medium of compressed air or otherwise.

These and other modifications are considered to be within the scope of my invention. a i v I claim: i

1. In combination, a heat exchange element, a motor driven fan. for moving air over said element, a heat valve controlling ther mostat in the space surrounding said ele-- ment, a stem controlled by said thermostat,

means providing lost motion between thea motor switch, means on saidstem for moving the switch to start and stop the motor fan, and means operative when said valve is closed for starting the motor preceding the opening of said valve. v v

3. In combination, a heat exchange element, a motor driven fan for moving air over said element, a heat valve controlhng thermostat in the space surrounding said element,

a stem controlled by said thermostat,a motor switch, means on said stem for moving the switch to start and stop the motor fan, and

means operative when said valve is closed for starting the motor preceding the opening,

of. said valve, and means for effecting a continuance of motor operation for a period after said valve is fully closed.

4. In comblnation, a radiator, a motor drlven fan for moving air over said radiator,

' signature.

heat to said radiator,"saidtherrnostat being" located in the space through which the supply of air is moved toward the radiator, said thermostathaving a valve operating stem, a lateral arm fixed to the stem, and a motor switch operated by said arm-5 7. In combination,"a heat' exchange ele-i ment, a motordriven fan for moving airover said element,- a'-heat valve controlling thermostat in the space surrounding said element, a stem connected to said valveand controlled on said stem for moving the switch to start and stop the motor fan.

In testimony I MORTON o. SNEDIKER.

whereof I have afiixed my g by said thermostat, a motor switch and-means a thermostat for controlling the supply of heat to said radiator, said thermostat being located in the space through which the supply of air is moved toward the radiator, a switch for the motor fan, means permitting a continuance of motor operation for a period after said valve is fully closed, and

means operated by the thermostat for then shutting ofi the motor.

5. In combination, a radiator, a motor driven fan for moving air over said radiator, a thermostat for controllin the supply of heat to said radiator, said t ermostat being located in the space through which the supply if air is drawn to the radiator, a switch or the motor fan, and means operated by the thermostat for actuatin eifect starting of the motor% is opened.

6. In combination, a radiator, a motor driven fan for moving air over said radiator, a thermostat for controlling the supply of said switch to efore the valve 

